Copypasta from the MKS forum where I've gotten no response -
Moon roof had been sporadically not closing correctly, I would eventually be able to get it closed but eventually stopped using it altogether out of fear of it getting stuck open. With the weather getting nicer I decided to investigate and found that when I used the vent feature, the driver's side of the panel would not articulate open but the passenger side would. If I tried to open the moon roof, it would retract maybe a couple of inches and then stop, fortunately I was able to get it closed without issue. A mechanic friend helped me pull the glass panel and found the hardware broken on the driver's side and the rails pretty badly cracked around the front portion of the unit, we did not examine the back.
I have a 2010, so I had a few questions - one, has there been any kind of revision to the moon roof rails after 2010 that might make the replacement unit more robust? Two, does anyone have any pointers on removing the headliner to get access to the moon roof assembly?